. Author manuscript; available in PMC: 2017 May 23.

Published in final edited form as: J Ethn Subst Abuse. 2015 Jul 25;14(4):351–363. doi: 10.1080/15332640.2014.991467

Table 2.

Factors Independently Associated with Injection Drug Use among Mexican Female Sex Workers (n=109)

	Model 1 OR (95% CI)	Model 2 OR (95% CI)	Model 3 OR (95% CI)	Model 4 OR (95% CI)
Sex Work History
Days Worked (past month)	1.08 (1.01, 1.15)			1.04 (0.97, 1.12)
Clients (past week)	1.05 (0.98, 1.13)
Sexual Risk Behaviors
Ever Infected with STD		2.01 (0.63, 6.37)
Sex with an IDU Client		3.38 (1.06, 10.81)		2.61 (0.80, 8.47)
Sex with IDU Partner		9.02 (2.38, 34.14)		4.03 (0.94, 17.38)
Unprotected Anal Sex with Client		2.28 (0.55, 9.51)
Unprotected Anal Sex with Partner		0.63 (0.13, 3.06)
Drug Use Risk Behaviors^*
Initiated Drug Use before Sex Work			2.61 (0.89, 7.61)
Current Use of Crack			7.90 (1.25, 50.17)	3.00 (0.26, 35.29)
Current Use of Non-Injection Cocaine			6.29 (1.78, 22.30)	4.13 (1.14, 15.00)
Hosmer-Lemeshow goodness of fit	x²=9.73, df=8, p=0.285	x²=6.19, df=8, p=0.402	x²=1.48, df=3, p=0.688	x²=7.00, df=8, p=0.537

Drug use before sex is excluded because it is not a stable measure.